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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Breedintg biology of great crested grebes (Podiceps cristatus) in different habitats in the Třeboň basin
 HÝLOVÁ, Alena
The aim of this study is to determine some breeding and ethology aspects of Great Crested grebes (Podiceps cristatus) in two different habitats in the Třeboň basin. The first locality is Nadějská rybniční soustava (NRS). It means 14 high eutrophic fish ponds near Třeboň. The second locality is in Hálámky and it is the gravel pits area. There are 4 ponds with low eutrophic water. This locality is similar to lakes - the origin biotope of Great Crested grebes (Podiceps cristatus). There are still active outputs of gravel in some of Halámky ponds. This study is based on breeding aspects, such as bird quantity, observing and measuring. Observations were carried out in 2004 - 2006. Whole day ethology monitoring was made in 2006. The data in Nadějská rybniční soustava are collected every 14 days from March to November. The data in Halámky are collected on the month base. The parameters of nests were measured during the breeding season. It was draught of nests, height above water level, height of water column, diameter of nests, ``kotlinka{\crqq} - a place for eggs in nest, ``korona{\crqq} - a special part of the nest. We focused on the parameters of eggs such as width, length and number of eggs in the nest as well.
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4 Hýlová, Adéla
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